Substitute for missing qr

ABSTRACT

AN IMAGING SYSTEM INCLUDING AN IMAGING MEMBER IN WHICH IMAGES HAVING IMAGE AND BACKGROUND AREAS WHICH OPTICALLY AFFECT INCIDENT LIGHT DIFFERENTLY IN SOME RESPECT SUCH AS, FOR EXAMPLE, OPTICAL ROTATION, RETARDATION, DICHROSIM, ETC. ARE FORMED. THE IMAGES ARE READ OUT IN REFLECTION BY AN OPTICAL READOUT SYSTEM AS DESCRIBED IN THE FIGURE WHICH INCLUDES A READOUT LIGHT SOURCE IS A COLLIMATING LENS 20, A CORRECTION PRISM 22 ARRANGED ADJACENT TO THE IMAGING MEMBER AND ADAPTED SO THAT THE ANGLE OF INCIDENCE OF THE READOUT ILLUMINATION TO THE FRONT SURFACE OF THE PRISM IS SUCH THAT IT RESULTS IN TOTAL INTERNAL REFLECTANCE AND A FIELD LENS 24 WHICH COLLECTS THE INFORMATION-MODULATED ILLUMINATION FOCUSES IT AT AN OUTPUT IMAGE PLANE 26. PREFERABLY, THE READOUT ILLUMINATION IS NORMAL TO THE SIDE SURFACE OF THE PRISM AND THE INFORMATION-MODULATED ILLUMINATION EXIST NORMAL OF THE FRONT SURFACE OF THE PRISM. IN A PREFERRED EMBODIMENT THE IMAGED MEMBER COMPRISES AN OPTICALLY NEGATIVE LIQUID CRYSTALLINE LAYER HAVING AREAS IN THE GRANDJEAN TEXTURE AND AREAS IN THE FOCAL-CONIC TEXTURE. A PREFERRED IMAGING MEMBER 10 COMPRISES A PAIR OF ELECTRODES AT LEAST ONE OF WHICH IS TRANSPARENT SANDWICHED AROUND A LAYER OF PHOTOCONDUCTIVE INSULATING MATERIAL AND A LAYER OF AN OPTICALLY NEGATIVE LIQUID CRYSTALLINE MATERIAL.

DEFENSIVE PUBLICATION UNITED STATES PATENT AND TRADEMARK OFFICE"Published at the request of the applicant or owner in accordance withthe Notice of Dec. f6, 1969, 869 O.G. 687. The abstracts of DefensivePublication applications are identified by distinctly numbered series,and are arranged chronologically. The heading of each abstract indicatesthe number of pages of specification, including claims and sheets ofdrawings contained in the application as originally filed. The files ofthese applications are available to the public for inspection andreproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to themerits of alleged invention. The Patent and Trademark Oflice makes noassertion as to the novelty of the disclosed subject matter.

PUBLISHED SEPTEMBER 2, 1975 T938,006 IMAGING SYSTEM Joseph F. Stephany,Sodus, N.Y., assignor to Xerox Corporation, Stamford, Conn. Fiied Oct.11, 1974, Ser. No. 514,699 Int. Cl. G021? 1/13 U.S. Cl. 350-160 R 1Sheet Drawing. 6 Pages Specification An imaging system including animaging member in which images having image and background areas whichoptically afiect incident light diflerently in some respect such as, forexample, optical rotation, retardation, dichroism, etc. are formed. Theimages are read out in reflection by an optical readout system asdescribed in the figure which includes a readout light source is acollimating lens 20, a correction prism 22 arranged adjacent to theimaging member and adapted so that the angle of incidence of the readoutillumination to the front surface of the prism is such that it resultsin total internal reflectance and a field lens 24 which collects theinformation-modulated illumination focuses it at an output image plane26. Preferably, the readout illumination is normal to the side surfaceof the prism and the information-modulated illumination exits normal tothe front surface of the prism. In a preferred embodiment the imagedmember comprises an optically negative liquid crystalline layer havingareas in the Grandjean texture and areas in the focal-conic texture. Apreferred imaging member 10 comprises a pair of electrodes at least oneof which is transparent sandwiched around a layer of photoconductiveinsulating material and a layer of an optiwlifle'gatiiif liquidcrystalline material.

